One of two or more people who are jointly entrusted with managing property, funds, or duties on behalf of another.
From prefix 'co-' (together) + 'trustee' (one entrusted with responsibility). Trustee comes from 'trust' via Old Norse 'traust.'
Corporate cotrustees emerged as modern finance grew more complex—having multiple trustees created checks and balances, so one person couldn't secretly misuse funds, turning partnership into a form of financial security.
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